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Modern Algorithms of AC Servo-drives Control
Hrnčárek, Martin ; Blaha, Petr (referee) ; Václavek, Pavel (advisor)
This master thesis deals with the modern algorithms of the asynchronous induction machine and permanent magnet induction machine. It focuses at vector control, direct torque control and input-output feedback linearization. It also describes a library creation and its usages in the Matlab – Simulink environment. The final part of this thesis contains an implementation of chosen algorithms on the DSC Freescale 56F800E family.
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PMSM Drive Sensorless Control
Graf, Miroslav ; Blaha, Petr (referee) ; Václavek, Pavel (advisor)
Bachelor's thesis "PMSM Drive Sensorless Control" concerns about stage reconstructors by PMSM drive control. It describes Model Reference Adaptive System and Kalman filter. Both stage reconstructor are practically implemented at microprocessor and using the method "target in the loop" the functionality of both reconstructors is verified.
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Modeling and simulation of the electric motor control
Kečkéš, Adam ; Pohl, Lukáš (referee) ; Bartík, Ondřej (advisor)
The aim of this bachelor's thesis is to study the issues of modeling three-phase electric motors and subsequently to create a suitable motor model in the d,q coordinates. The thesis outlines the issues related to controlling three-phase motors, based on which the Six-step and Vector control algorithms are implemented and analyzed. A simulation demonstrating closed-loop control with a suitable algorithm is created for the prepared motor model in the d,q coordinates. Subsequently, a suitable state feedback controller is implemented. The final part of the thesis consists of analyzing nonlinearities such as friction and dead zone.
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Does trading strategy based on overreaction and stock-bond decoupling generate additional profits?
Bosák, Martin ; Čech, František (advisor) ; Baruník, Jozef (referee)
Studying whether new trading rules provide higher returns than the buy-and-hold strategy is relevant for both finance theory and the asset management field. In this thesis, we examine the profitability of the newly proposed trading strategy based on the concept of price overreaction on eight developed stock indices. In comparison to other studies, we extend a definition of price overreaction with an inclusion of a minimum volatility threshold. Based on the Ordinary Least Squares model, we find that a volatility condition significantly improves the predictability of return reversals after positive price overreaction. For comparison with the buy-and-hold, we use Hansen's Superior Predictive Ability test that corrects the data snooping bias. Despite better annualised returns during in-sample and out-of-sample periods, the results show that the proposed strategy is not superior to the buy-and-hold at any stock index due to heavy reliance on the predictions of the largest declines. Nevertheless, we confirm the effect of decoupling (flight to quality) that can positively affect our strategy, but only when we do not take into account transaction costs. In the end, we summarize behavioural concepts that lie behind our strategy as the overreaction and decoupling are mostly justified with cognitive biases.
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Regional Integration of Japanese Foreign Trade
Fialová, Anežka ; Sýkora, Jan (advisor) ; Labus, David (referee)
BACHELOR THESIS Regional Integration of Japanese Foreign Trade Anežka Fialová, 2013 Abstract This work summarizes the development of geographical linkages of Japanese foreign trade on the turn of the 20th century. Its main goal is to investigate, whether there is a clear departure from the dependency on the western economies (US, EU) towards the region of East Asia. Theoretically the work builds on the concept of economic decoupling. At the same time it also mentions the problem of applicability of this concept in the region given the vertical integration of the East Asian trade. Methodologically is the work based on an analytical approach to statistical data and existing literature. Apart from the macroeconomic indicators such as trade volumes, main commodities and foreign trade policy, the influence of the microeconomic factors (mainly the behavior of the Japanese MNC) on the international linkages of the Japanese foreign trade is examined. The results show that the importance of the regional trade is increasing relatively to the extra regional trade. However this process has just begun and it is therefore too early to speak about economic decoupling.
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Decoupling of environmental pressure and environmental impact from economic performance
Kovalský, Pavel ; Kovanda, Jan (advisor) ; Třebický, Viktor (referee)
7 Abstract The thesis analyses trends of two environmental aspects in spatial terms of the Czech Republic and timal terms since 1993 till 2010. The two aspects are acid deposition as environmental pressure and defoliation of forest crown as environmental impact. Since one aspect is cause of the other the thesis also analyses trends of relationship between these aspects and comapares the results with the concept of decoupling of environmental pressure from economic growth. Important findings are that despite huge relative decrease of environmental pressure expressed by acid deposition the decrease of environmental impact expressed by forest crown defoliation is very low. Although decoupling occured during the analyzed period it's not possible to say that linkage between "environmental bads" and "economic goods" was broken. The thesis reveals factors that had influence on these findings. The thesis also compares particular concepts of decoupling being used and provides author's input on which of these concepts suits the best analyzing the breakage of the links between environmental pressure from economic growth in all of its aspects. Key words: sustainable development, sustainability, decoupling of environmental pressure from economic growth, acid deposition, defoliation, gross domestic product.
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PMSM Drive Sensorless Control
Graf, Miroslav ; Blaha, Petr (referee) ; Václavek, Pavel (advisor)
Bachelor's thesis "PMSM Drive Sensorless Control" concerns about stage reconstructors by PMSM drive control. It describes Model Reference Adaptive System and Kalman filter. Both stage reconstructor are practically implemented at microprocessor and using the method "target in the loop" the functionality of both reconstructors is verified.
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Modern Algorithms of AC Servo-drives Control
Hrnčárek, Martin ; Blaha, Petr (referee) ; Václavek, Pavel (advisor)
This master thesis deals with the modern algorithms of the asynchronous induction machine and permanent magnet induction machine. It focuses at vector control, direct torque control and input-output feedback linearization. It also describes a library creation and its usages in the Matlab – Simulink environment. The final part of this thesis contains an implementation of chosen algorithms on the DSC Freescale 56F800E family.
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